11

This number is a prime.

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The smallest prime which when sandwiched between a two-digit repdigit gives a multiple of 11. In other words 1111, 2112, 3113, 4114, 5115, 6116, 7117, 8118, and 9119 are multiples of 11. [Meller]

Submitted: 2009-07-04 18:40:29; Last Modified: 2009-07-04 20:54:00.